Veins Or Reefs May Be Described As Layers, Which Have Been Deposited In
Fissures And Cracks In The Rock Surrounding Them.
The enclosing rock is
known as the "country rock." "Lodes" are veins composed of a mixture of
quartz, ironstone, and other material, and usually exceed in width the
"reefs," which sometimes, as at Southern Cross, attain thirty feet, but
are rarely more than one to four feet in thickness.
The part of a reef
showing above the surface is the "outcrop," which may appear either as a
mass or "blow" of quartz, sometimes sixty feet in height, or as a solid
wall or dyke which can be followed for perhaps five miles without a break;
the direction in which it runs is known as its "strike."
Reefs may go down vertically, or on a sloping "dip" or "underlay." The
country rock lying immediately above the reef is the "hanging wall," and
that immediately below, the "foot wall."
In prospecting a reef, a miner walks along the strike of the outcrop,
"napping" as he goes, i.e., breaking off with a hammer or pick, pieces of
the quartz or ironstone outcrop. Each fragment is carefully examined for
the presence of gold, which is nearly always found, if on the surface, in
a free state, that is to say, uncombined with any other mineral. If any
gold is present, it may occur in small specks as fine as flour, or in
large solid lumps as big as one's fist, as in Bayley's Reward Claim,
Londonderry, and one or two other mines.
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